General Principles for Accessibility
Whenever possible, use structural elements to structure your document. Use built-in headings and lists instead of relying on manual formatting on documents, slides, and tables. If available, start from a template.
Don’t use color as the only way to communicate information. If you are using colors, make sure to have sufficient contrast.
Put alt text (text descriptions) on images and graphs. (More info)
Make sure all videos you are using have accurate captions and a transcript.
Examples
Use of structural elements in LaTeX
or
Use of colors in LaTeX
Generally, the following LaTeX colors should have sufficient contrast over white background:
`blue`, `purple`, `teal`, `violet`, `black`, `darkgray`